CN113294345B - Centrifugal pump operation system and control method for centrifugal pump operation system - Google Patents
Centrifugal pump operation system and control method for centrifugal pump operation system Download PDFInfo
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- CN113294345B CN113294345B CN202110582383.8A CN202110582383A CN113294345B CN 113294345 B CN113294345 B CN 113294345B CN 202110582383 A CN202110582383 A CN 202110582383A CN 113294345 B CN113294345 B CN 113294345B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
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Abstract
The invention discloses a centrifugal pump operation system, which comprises a centrifugal pump, a vacuum pump and a connecting pipeline for connecting the centrifugal pump and the vacuum pump, wherein the connecting pipeline comprises a liquid column pipe section and a vacuum pipe section which are sequentially communicated, the liquid column pipe section is arranged in an extending way along the upper and lower directions, the lower end of the liquid column pipe section is communicated with the top of the centrifugal pump, the upper end of the liquid column pipe section is communicated with the vacuum pump through the vacuum pipe section, when the vacuum pump applies negative pressure to a cavity in the centrifugal pump, air in the cavity is completely discharged, negative pressure is formed in the vacuum pipe section, and the liquid column is stored in the liquid column pipe section due to the action of atmospheric pressure. According to the technical scheme provided by the invention, the leaked air can be separated in the liquid column, the air enters the vacuum pipe section, and only air is discharged when the vacuum pump is pumping, so that the problems that in the existing centrifugal pump operation system, the vibration is rapidly increased when the vacuum pump is operated in order to maintain the centrifugal pump in a qualified vacuum state, and the blades are easy to be corroded and damaged are solved.
Description
Technical Field
The invention relates to the field of water pump auxiliary equipment, in particular to a centrifugal pump operation system and a control method of the centrifugal pump operation system.
Background
In many occasions, the centrifugal pump needs to be installed at a high position, namely, the centrifugal pump body is higher than the horizontal position of the suction inlet, the air in the pump body needs to be pumped out through the vacuumizing system, the pump body is guaranteed to be full of water, and the centrifugal pump can start to pump liquid.
In the important occasion of power station or other industrial systems, two water pumps are connected in parallel and are used for one, the centrifugal pump is required to have standby conditions, namely, the pump body of the centrifugal pump is kept full of water all the time, a vacuumizing system is required to continuously run, the centrifugal pump is vacuumized to maintain the vacuum of the centrifugal pump, and the conventional vacuumizing system has the following problems: in the prior art, a water ring type vacuum pump is generally adopted to pump water to the centrifugal pump, after the centrifugal pump is qualified in vacuum and is filled with water, the centrifugal pump and a vacuumizing pipeline system are filled with water, at the moment, the water ring type vacuum pump pumps out water, the water ring type vacuum pump operates under the extreme vacuum working condition, the water ring type vacuum pump becomes a water pump to operate, noise and vibration are increased rapidly, blades are damaged due to water erosion, and the vacuum pump cannot guarantee long-period operation.
Disclosure of Invention
The invention mainly aims to provide a centrifugal pump operation system and a control method of the centrifugal pump operation system, and aims to solve the problems that in the conventional centrifugal pump operation system, when a vacuum pump is in a qualified vacuum state, a water pump is required to operate to pump a mixture of water and gas, noise and vibration are increased sharply when the vacuum pump is operated, and a blade is easy to erode and damage.
To achieve the above object, the present invention provides a centrifugal pump operation system, wherein the centrifugal pump operation system includes:
the centrifugal pump is internally provided with a cavity, the top of the centrifugal pump is provided with an exhaust port communicated with the cavity, the centrifugal pump is also provided with a liquid inlet and a liquid outlet communicated with the cavity, the liquid inlet is communicated with a water source, and the centrifugal pump is used for pumping liquid provided by the water source into the cavity and discharging the liquid from the liquid outlet;
the vacuum pump is communicated with the exhaust port and is used for applying negative pressure to the cavity; the method comprises the steps of,
the connecting pipeline is used for communicating the exhaust port and the vacuum pump, and comprises a liquid column pipe section and a vacuum pipe section which are sequentially communicated, wherein the liquid column pipe section extends up and down, the lower end of the liquid column pipe section is communicated with the exhaust port, and the upper end of the liquid column pipe section is communicated with the vacuum pump through the vacuum pipe section;
the negative pressure generated by the vacuum pump enables negative pressure to be formed in the vacuum pipe section, and the liquid column pipe section stores a liquid column.
Optionally, the vacuum pipe section is provided with a communicating pipe section extending up and down, the communicating pipe section and the liquid column pipe section are horizontally arranged at intervals, and the lower end of the communicating pipe section is communicated with the vacuum pump;
the connecting pipeline further comprises an adjusting pipe section which is connected with the vacuum pipe section and the communicating pipe section in parallel, one end of the adjusting pipe section is communicated with the lower end of the communicating pipe section, the other end of the adjusting pipe section is communicated with the lower end of the liquid column pipe section, and a bypass valve is arranged on the adjusting pipe section.
Optionally, the liquid column pipe section is located above the liquid inlet, and a height difference between the upper end of the liquid column pipe section and the liquid inlet is greater than 10.5 meters.
Optionally, the vacuum pump comprises a water ring vacuum pump and a water replenishing device, and the water replenishing device is connected with the water ring vacuum pump and is used for replenishing water for the water ring vacuum pump so that the water ring vacuum pump reaches a starting state.
Optionally, a check valve is arranged between the lower end of the communicating pipe section and the vacuum pump.
Optionally, the centrifugal pump operation system further comprises a drainage structure, wherein the drainage structure is communicated with the liquid column pipe section and is used for draining liquid in the liquid column pipe section.
The invention also provides a control method of the centrifugal pump operation system, which comprises the following steps:
controlling the water ring type vacuum pump to work to generate negative pressure so as to enable the cavity to generate negative pressure, and enabling liquid provided by the water source to enter the cavity from the liquid inlet and flow into the liquid column pipe section;
closing the check valve when the liquid column pipe section is formed with a liquid column;
and controlling the centrifugal pump to start working.
Optionally, the step of controlling the water ring vacuum pump to operate to generate negative pressure so that the chamber generates negative pressure, and the surface water enters the chamber from the liquid inlet and flows into the liquid column pipe section comprises the following steps of:
opening the bypass valve;
controlling the water ring type vacuum pump to work to generate negative pressure so as to enable the cavity to generate negative pressure, and enabling liquid provided by the water source to enter the cavity from the liquid inlet;
when the chamber is full of the liquid, the bypass valve is closed such that the liquid flows into the liquid column tube segment.
Optionally, the step of controlling the centrifugal pump to start operating further includes:
controlling the centrifugal pump to stop working;
the bypass valve is opened.
Optionally, the step of controlling the centrifugal pump to start operating further includes:
controlling the centrifugal pump to stop working;
and controlling the water draining structure to drain the water in the liquid column pipe section.
According to the technical scheme, the centrifugal pump operation system comprises a centrifugal pump, a vacuum pump and a connecting pipeline for connecting the centrifugal pump and the vacuum pump, a cavity is formed in the centrifugal pump, an exhaust port communicated with the cavity is formed in the top of the centrifugal pump, the centrifugal pump is further provided with a liquid inlet and a liquid outlet communicated with the cavity, the liquid inlet is communicated with a water source, the centrifugal pump is used for pumping liquid provided by the water source to the cavity and discharging the liquid from the liquid outlet, the position of the centrifugal pump which is installed at a high position is higher than that of the water source, the condition that the centrifugal pump needs to be started is that the cavity is filled with water, negative pressure is applied to the cavity due to the fact that the vacuum pump is communicated with the exhaust port, the connecting pipeline comprises a liquid column pipe section and a vacuum pipe section which are sequentially communicated, the liquid column pipe section extends vertically, the lower end of the liquid column pipe section is communicated with the exhaust port, the upper end of the liquid column pipe section is communicated with the vacuum pump through the vacuum pipe section, and the vacuum pipe section is arranged in the connecting pipeline, when negative pressure is generated in the cavity, and the vacuum pump is enabled to be completely discharged due to the fact that the negative pressure is generated in the cavity, and the vacuum pump is enabled to have a vacuum effect. The air leaked in can be separated in the liquid column, the air enters the vacuum pipe section, meanwhile, the liquid column is reduced in a short time, the vacuum pump can discharge the air in the vacuum pipe section, and the liquid column is restored to a limit value of a certain height due to the action of atmospheric pressure and cannot enter the vacuum pipe section, so that the vacuum pump only discharges gas in the process of maintaining the centrifugal pump in a starting state, and the vacuum pump can not pump out a mixture of liquid and gas even basically all the liquid as in the prior art, and the vacuum pump is prevented from being changed into a water pump to operate, so that the problems that in order to maintain the centrifugal pump in a qualified vacuum state, the vacuum pump only can be subjected to noise and vibration rapid increase and blades are easy to be damaged due to water erosion in the conventional centrifugal pump operation system are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art centrifugal pump operating system;
FIG. 2 is a schematic diagram of one embodiment of a centrifugal pump operating system provided by the present invention;
FIG. 3 is a schematic flow chart of a first embodiment of a control method of a centrifugal pump operation system according to the present invention;
FIG. 4 is a schematic flow chart of a second embodiment of a control method of a centrifugal pump operation system according to the present invention;
fig. 5 is a schematic flow chart of a third embodiment of a control method of a centrifugal pump operation system provided by the invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
In many occasions, the centrifugal pump needs to be installed at a high position, namely, the centrifugal pump body is higher than the horizontal position of the suction inlet, the air in the pump body needs to be pumped out through the vacuumizing system, the pump body is guaranteed to be full of water, and the centrifugal pump can start to pump liquid. In the important occasion of power station or other industrial systems, two water pumps are connected in parallel and are used for one, the centrifugal pump is required to have standby conditions, namely, the pump body of the centrifugal pump is kept full of water all the time, a vacuumizing system is required to continuously run, the centrifugal pump is vacuumized to maintain the vacuum of the centrifugal pump, and the conventional vacuumizing system has the following problems:
referring to fig. 1, in the prior art, after the water in the centrifugal pump is pumped out and connected to the vacuum pump through the main pipe horizontally arranged, air in the centrifugal pump is removed, at this time, in an ideal state, at least part of the main pipe and the vacuum pump are in a water state, and it is to be noted that, in the process of operating the actual vacuum pump, the water draining capability of the main pipe is relatively strong, basically, in order to ensure that the centrifugal pump is in a qualified vacuum state, the vacuum pump is continuously operated for a period of time, at this time, the vacuum pump and the main pipe are also in a state of being substantially full of water, but the centrifugal pump and the connecting pipe system are not in a strictly sealed state, a small amount of gas leaks into the main pipe, so that the centrifugal pump cannot normally operate under a qualified vacuum condition, at this time, the vacuum pump is required to continuously operate to remove the air, but the amount of the leaked gas is generally relatively small, and when the vacuum pump is continuously operating, the air draining capability of the vacuum pump is definitely exceeds the amount of the leaked gas, so that the vacuum pump is in a water pump operating state.
In order to solve the above-mentioned problems, the present invention provides a centrifugal pump operation system 100, and fig. 2 is a schematic diagram of an embodiment of the centrifugal pump operation system 100 according to the present invention.
Referring to fig. 2, the centrifugal pump operation system 100 includes a centrifugal pump 1, a vacuum pump 2, and a connecting pipe 3, a chamber 11 is formed in the centrifugal pump 1, an air outlet communicating with the chamber 11 is formed at the top of the centrifugal pump 1, the centrifugal pump 1 is further provided with a liquid inlet and a liquid outlet communicating with the chamber 11, the liquid inlet is used for communicating with a water source 1000, and the centrifugal pump 1 is used for extracting liquid provided by the water source 1000 to the chamber 11 and discharging the liquid from the liquid outlet; the vacuum pump 2 is communicated with the exhaust port, and the vacuum pump 2 is used for applying negative pressure to the cavity 11; the connecting pipeline 3 is used for communicating the exhaust port and the vacuum pump 2, the connecting pipeline 3 comprises a liquid column pipe section 31 and a vacuum pipe section 32 which are communicated in sequence, the liquid column pipe section 31 is arranged in an extending mode along the up-down direction, the lower end of the liquid column pipe section 31 is communicated with the exhaust port, and the upper end of the liquid column pipe section 31 is communicated with the vacuum pump 2 through the vacuum pipe section 32; wherein the negative pressure generated by the vacuum pump 2 causes the vacuum pipe section 32 to form a negative pressure, and the liquid column pipe section 31 stores a liquid column therein.
According to the technical scheme provided by the invention, the centrifugal pump operation system 100 comprises a centrifugal pump 1, a vacuum pump 2 and a connecting pipeline 3 for connecting the centrifugal pump 1 and the vacuum pump 2, wherein a cavity 11 is formed in the centrifugal pump 1, an exhaust port for communicating with the cavity 11 is formed at the top of the centrifugal pump 1, the centrifugal pump 1 is also provided with a liquid inlet and a liquid outlet for communicating with the cavity 11, the liquid inlet is used for communicating with a water source 1000, the centrifugal pump 1 is used for pumping liquid provided by the water source 1000 to the cavity 11 and discharging the liquid from the liquid outlet, the condition that the centrifugal pump 1 needs to be started is that the cavity 11 is filled with water because the position of the centrifugal pump 1 arranged at a high position is higher than the water source 1000, negative pressure is applied to the cavity 11 because the vacuum pump 2 is communicated with the exhaust port, the liquid column 31 and the vacuum pipe section 32 are sequentially communicated, the liquid column 31 extends downwards, the lower end of the liquid column 31 is communicated with the exhaust port and the liquid column 31 is communicated with the exhaust port, and the vacuum pump 2 is completely discharged through the vacuum pipe section 32 because the vacuum pump 2 is arranged in the vacuum pipe section, and the vacuum pump is completely communicated with the cavity 2. Through the liquid column stored in the liquid column pipe section 31, when a small amount of gas leaks into the chamber 11 of the centrifugal pump 1, the leaked air can be separated in the liquid column, the air enters the vacuum pipe section 32, meanwhile, the height of the liquid column changes along with the leaked air amount, the vacuum pump can discharge the air in the vacuum pipe section 32, and the liquid column is restored to a certain height limit value due to the action of atmospheric pressure and cannot enter the vacuum pipe section 32, so that the vacuum pump 2 only discharges the gas in the process of maintaining the centrifugal pump in a activatable state, and the mixture of liquid and gas, which is not pumped by the vacuum pump as in the prior art, is not even basically all liquid, so that the vacuum pump 2 is prevented from being changed into a water pump to operate, and the problems that in the conventional centrifugal pump operation system 100, when the vacuum pump 2 is in order to maintain the centrifugal pump 1 in a qualified vacuum state, the noise and vibration are rapidly increased and the blades are easy to be corroded and damaged by water are solved.
It will be appreciated that after the vacuum pump 2 is stopped, the liquid column in the liquid column pipe section can be maintained for a certain time, and the longer the time, the better tightness of the centrifugal pump and the vacuum pumping pipeline thereof is. The vacuum pump 2 continuously pumps air into the vacuum pipe section 32 to form negative pressure, so that the liquid column can be basically restored and maintained within the limit value height.
Specifically, since the existing centrifugal pump operation system still retains the original main pipeline, the centrifugal pump operation system 100 is modified to the original centrifugal pump operation system, and then the adapting and improving can be performed according to the existing centrifugal pump operation system, in this embodiment, the vacuum pipe section 32 has a communicating pipe section 32a extending up and down, the communicating pipe section 32a and the liquid column pipe section 31 are arranged at intervals in the horizontal direction, the lower end of the communicating pipe section 32a is communicated with the vacuum pump 2, the connecting pipeline 3 further includes a regulating pipe section 33 that is arranged in parallel with the liquid column pipe section 31 and the communicating pipe section 32a, one end of the regulating pipe section 33 is arranged in communication with the lower end of the liquid column pipe section 31, the other end of the regulating pipe section 33 is arranged in communication with the lower end of the communicating pipe section 32a, and the regulating pipe section 33 can be understood as a section of the main pipe of the original centrifugal pump operation system 100, while the liquid column pipe section 31 and the communicating pipe section 32a are added for realizing the improvement after that, for the convenience of regulation and switching, the bypass valve 4 is arranged at the position and the bypass valve 4 is used for the working principle: when the centrifugal pump operation system 100 needs to be started to operate, firstly, all communicated valves on the centrifugal pump operation system 100, including the bypass valve 4, can be opened, so that the smoothness of the whole pipeline is ensured; then the vacuum pump 2 is started, the air in the centrifugal pump 1 is gradually emptied, the chamber 11 is gradually filled with liquid, the former main pipeline is also filled with liquid, in order to prevent the vacuum pump 2 from being in a water pump running state all the time, the bypass valve 4 can be closed at this time, so that the water path of the main pipeline, namely the regulating pipe section 33, is cut off, at this time, the liquid flows into the liquid column pipe section 31 arranged in parallel with the regulating pipe section 33, the vacuum pump 2 continuously pumps out the water-air mixture of the liquid and the air in the pipe, finally, the liquid column pipe section 31 and the communicating pipe section 32a maintain a negative pressure state, the liquid column pipe section 31 extends up and down, and can be set to a height which can be matched with the negative pressure, so that when the stable negative pressure is maintained in the vacuum pipe section 32, the height of the liquid column in the liquid column pipe section 31 is always only in the liquid column pipe section 31, and cannot flow into the communicating pipe section 32 a.
Specifically, in view of practical application environments, most of the cases of using the centrifugal pump operation system 100 are that surface water is pumped, in this embodiment, the liquid is surface water, the air pressure of the environment is a standard atmospheric pressure, so the negative pressure value generated by the vacuum pump 2 can support a water column with a maximum ideal height of 10.339 meters, and the liquid column tube section 31 is also disposed on the surface, and the lower end of the liquid column tube section 31 is substantially consistent with the height of the surface water, because the liquid column tube section 31 is located above the liquid inlet, so that the upper end of the liquid column tube section 31 and the liquid inlet form a height difference d, and in order to ensure that the supported water column does not flow into the communication tube section 32a, the height difference d may be set to be greater than 10.5 meters. Of course, in the case that the air pressure value is not a standard atmospheric pressure, the highest height of the water column will also change, and it will be understood that the height of the liquid column tube section 31 can be adapted to the air pressure value of the external atmospheric pressure to make an adaptive improvement, and the height of the liquid column tube section 31 is within the scope of protection of the present solution as long as it exceeds the highest value that the liquid column can reach during the operation of the centrifugal pump operation system 100.
Further, in order to ensure that the connection pipe 3 is continuously in a negative pressure state after the centrifugal pump 1 reaches the start condition, in this embodiment, the vacuum pipe section 32 further includes a check valve 5 provided between the lower end of the communication pipe section 32a and the vacuum pump 2. When the centrifugal pump operation system 100 is in a qualified negative pressure state, the check valve 5 is closed, the check valve 5 can isolate a pipeline from the vacuum pump 2, and a closed negative pressure system is formed between the check valve 5 and the centrifugal pump 1 through the check valve 5, so that the centrifugal pump operation system 100 is further prevented from leaking into gas from one end of the vacuum pump 2. In the actual use process, two vacuum pumps 2 can be arranged in parallel, when one vacuum pump 2 fails, the check valve 5 is automatically closed, so that the pipeline is still kept in a negative pressure state to prevent air from leaking in, and therefore, the check valve 5 can also play a role in closing when the vacuum pump 2 is stopped or damaged.
Further, in the present embodiment, the vacuum pipe section 32 further includes an isolation valve 6 provided between the check valve 5 and the lower end of the communication pipe section 32 a. The isolation valve 6 plays an isolating role when the vacuum pump 2 is overhauled.
Further, after the centrifugal pump operation system 100 completes the pumping operation of one stage, the centrifugal pump operation system 100 is shut down, at this time, the water in the centrifugal pump operation system 100 flows back to the low water level area, but in actual operation, still a part of water column will remain in the liquid column tube section 31, in order to make the residual water completely drain, in this embodiment, the centrifugal pump operation system 100 further includes a drainage structure, the drainage structure is communicated with the liquid column tube section 31 and is configured to drain the water in the liquid column tube section 31, the drainage structure may be a pumping hole formed on the side wall of the liquid column tube section 31, the negative pressure device pumps the water in the liquid column tube section 31 completely through the pumping hole, so that the water in the centrifugal pump operation system 100 is completely drained through the drainage structure, and before the pumping operation of the next stage, the residual water column in the liquid column tube section 31 is not counteracted by the standard liquid column height, so that when the water ring pump is drained again, the negative pressure in the centrifugal pump reaches the standard value of the acceptable value of the centrifugal pump 100 is not reached, and the standard value of the acceptable value is not reached.
Further, because the operation condition of the water ring vacuum pump is that a part of water is reserved in the pump body of the water ring vacuum pump, in this embodiment, the vacuum pump 2 comprises the water ring vacuum pump and a water supplementing device, a cavity is formed in the water ring vacuum pump, the water ring vacuum pump is further provided with a water through hole communicated with the cavity, the top of the water ring vacuum pump is provided with a vent communicated with the cavity, the water supplementing device is communicated with the water through hole, and the water supplementing device is used for supplementing water to the cavity so that the water ring vacuum pump reaches a starting state.
Specifically, the water-ring vacuum pump utilizes the centrifugal force generated by the high-speed rotation of the eccentric impeller, the working fluid is thrown out in the impeller due to the action of the centrifugal force, meanwhile, negative pressure is formed at the inlet, air is sucked, the air-water mixture enters the air-water separator, in the embodiment, the water replenishing device comprises the air-water separator 7, a separation chamber 71 is formed in the air-water separator 7, a first through hole and a second through hole which are communicated with the separation chamber 71 are formed in the top of the air-water separator 7, the first through hole is used for being communicated with the air vent, so that the mixture of water and gas pumped by the water-ring vacuum pump can be discharged into the separation chamber 71 of the air-water separator 7 through the air vent, the water is deposited downwards due to the action of the gravity in the separation chamber 71, and the air can be located at the upper part of the separation chamber 71, and thus water and gas can be separated. The gas-water separator 7 is further provided with a water outlet communicated with the separation chamber 71, and the water outlet is communicated with the water port, so that the separated water can be supplemented and returned into the cavity of the water-ring vacuum pump, and the water-ring vacuum pump is ensured to be in a state capable of normally running all the time. The water replenishing device further comprises a water inlet pipe communicated with the separation chamber 71, a water replenishing electromagnetic valve 8 can be arranged on the water inlet pipe, the water inlet pipe is used for inputting water into the separation chamber 71, the separation chamber 71 is internally communicated with the cavity, so that water can be replenished in the cavity, the water inlet pipe is arranged, and the water inlet pipe can be controlled by controlling the water replenishing electromagnetic valve 8 when the water ring type vacuum pump needs water replenishing.
Further, in order to control the water amount in the water ring vacuum pump conveniently, the height of the water line in the separation chamber 71 needs to be controlled, in this embodiment, an overflow port communicated with the separation chamber 71 is provided at the top of the gas-water separator 7, the overflow port is located above the water outlet, and the height of the overflow port is set at the water level line of the water amount required in the water ring vacuum pump, that is, at the working water level of the water ring vacuum pump, when the water in the separation chamber 71 is too much, the excessive water overflows from the overflow port.
Further, the communicating pipeline further comprises an electromagnetic valve 9 arranged between the centrifugal pump 1 and the lower end of the liquid column pipe section 31, the electromagnetic valve 9 is controlled to be opened before the centrifugal pump 1 is started, then vacuum is pumped through the vacuum pump 2, when the centrifugal pump 1 has a starting condition, after the centrifugal pump 1 starts to run, the electromagnetic valve 9 can be closed, so that the centrifugal pump 1 can keep a stable working state.
The invention also provides a control method of the centrifugal pump operation system.
Referring to fig. 3, fig. 3 is a flowchart illustrating a control method of the centrifugal pump operation system according to the first embodiment of the present invention.
In a first embodiment, the control method of the centrifugal pump operation system includes the steps of:
and step S10, controlling the water ring type vacuum pump to work to generate negative pressure so as to enable the cavity to generate negative pressure, and enabling the surface water to enter the cavity from the liquid inlet and flow into the liquid column pipe section.
In a specific implementation, the vacuum pump 2 is communicated with the exhaust port, negative pressure is applied to the chamber 11, the connecting pipeline 3 comprises a liquid column pipe section 31 and a vacuum pipe section 32 which are sequentially communicated, the liquid column pipe section 31 is arranged in an extending mode along the upper and lower directions, the lower end of the liquid column pipe section 31 is communicated with the exhaust port, the upper end of the liquid column pipe section 31 is communicated with the vacuum pump 2 through the vacuum pipe section 32, and when the negative pressure generated by the vacuum pump 2 is generated through the connecting pipeline 3, air in the chamber 11 is completely discharged, and negative pressure is formed in the vacuum pipe section 32 due to the action of atmospheric pressure, so that liquid is stored in the liquid column pipe section 31.
And step S20, closing the check valve when the water column is formed on the liquid column pipe section.
In a specific implementation, when the water column is formed on the liquid column pipe section 31, the centrifugal pump 1 reaches a starting condition, the check valve 5 is closed, the check valve 5 can isolate a pipeline from the vacuum pump 2, and a closed negative pressure system is formed between the check valve 5 and the centrifugal pump 1 through the check valve 5.
And step S30, controlling the centrifugal pump to start working.
In a specific implementation, after the centrifugal pump operation system 100 is in a qualified negative pressure state, the chamber 11 of the centrifugal pump 1 is filled with water, so that a starting precondition is reached, and normal water pumping and draining can be realized.
In this embodiment, the leaked air can be separated in the liquid column, the air enters the vacuum pipe section 32, meanwhile, the liquid column is lowered for a short time, the vacuum pump can discharge the air in the vacuum pipe section 32, and the liquid column is restored to a certain height limit value due to the action of atmospheric pressure and cannot enter the vacuum pipe section 32, so that the vacuum pump 2 only discharges the air in the process of maintaining the centrifugal pump in a starting state, and the mixture of the liquid and the gas which is not pumped by the vacuum pump is not even basically all the liquid as in the prior art, thereby preventing the vacuum pump 2 from being changed into a water pump operation, and preventing the vacuum pump 2 from being changed into a water pump operation, so as to solve the problems that in the conventional centrifugal pump operation system 100, when the vacuum pump 2 is in order to maintain the centrifugal pump 1 in a qualified vacuum state, the noise and vibration are rapidly increased and the blades are easy to be corroded and damaged by water during the water operation of the vacuum pump 2.
In an embodiment, as shown in fig. 4, a second embodiment of a control method of the centrifugal pump operation system according to the present invention is proposed based on the first embodiment, and the step S10 includes:
step S101, opening the bypass valve.
In a specific implementation, when it is desired to start operating the centrifugal pump operation system 100, all the connected valves on the centrifugal pump operation system 100, including the bypass valve 4, may be opened first, so as to ensure the smoothness of the entire pipeline.
And step S102, controlling the water ring type vacuum pump to work to generate negative pressure so as to enable the chamber to generate negative pressure, and enabling the surface water to enter the chamber from the liquid inlet.
In a specific implementation, the vacuum pump 2 is started, the air in the centrifugal pump 1 is gradually emptied, the chamber 11 generates negative pressure, the surface water enters the chamber 11 from the liquid inlet, the chamber 11 is gradually filled with water, and the previous main pipeline is also filled with water.
Step S103, closing the bypass valve when the chamber is filled with the surface water, so that the surface water flows into the liquid column pipe section.
In a specific implementation, when the cavity is full of the surface water, the bypass valve 4 may be closed at this time, so that the waterway of the main pipeline, that is, the adjusting pipe section 33, is cut off, at this time, water flows into the liquid column pipe section 31 parallel to the adjusting pipe section 33, the vacuum pump 2 continuously pumps out the water-air mixture of the liquid and the air in the pipe, so that the liquid column pipe section 31 and the communicating pipe section 32a maintain a negative pressure state, the liquid column pipe section 31 extends up and down, and may be set to a height that can be adapted to the negative pressure, so that when the vacuum pipe section 32 maintains a stable negative pressure, the height of the liquid column in the liquid column pipe section 31 is always only in the liquid column pipe section 31 and does not flow into the communicating pipe section 32 a.
In this embodiment, because the draining capacity of the vacuum pump is relatively strong during the operation of the actual vacuum pump, basically in order to ensure that the centrifugal pump is in a qualified vacuum state, the vacuum pump can continuously operate for a period of time, at this time, the vacuum pump and the main pipeline are also in a state of being basically full of water, but the centrifugal pump and the connecting pipeline system are not in a strictly sealed state, a small amount of gas leaks into the centrifugal pump, so that the centrifugal pump cannot normally operate due to the fact that the centrifugal pump cannot reach a qualified vacuum condition, at this time, the vacuum pump is required to continuously operate to remove air, but the draining capacity of the vacuum pump is definitely higher than the volume of the leaked gas when the vacuum pump continuously operates to remove air, so that the vacuum pump is in a water pump operation state, and in order to prevent the vacuum pump 2 from being in a water pump operation state all the time, by adjusting the bypass valve 4, the water can flow into the liquid column pipeline section 31 arranged in parallel to the adjusting pipeline 33, and after the water column rises to a limit state, the vacuum pump is in a qualified state, and the water pump is not in a vacuum ring state.
In an embodiment, as shown in fig. 5, a third embodiment of the control method of the centrifugal pump operation system according to the present invention is proposed based on the second embodiment, and the step S103 further includes:
and step S1041, controlling the centrifugal pump to stop working.
After the centrifugal pump 1 does not need to perform water pumping and draining, the centrifugal pump 1 can be controlled to stop working, part of water column still remains in the liquid column pipe section 31, and in order to completely drain the residual water, the standard liquid column height cannot be counteracted in the liquid column pipe section 31 due to the residual water column, so that when the water ring type vacuum pump performs water pumping and draining again, the negative pressure value in the centrifugal pump operation system 100 cannot reach the qualified standard, and is lower than the value of the qualified standard, thereby influencing the starting condition of the centrifugal pump 1.
Step S1051, opens the bypass valve.
In a specific implementation, the bypass valve is opened at this time, and all communicated valves on the pipeline are also used to enable the centrifugal pump operation system 100 to be communicated with the outside, the internal and external atmospheric pressures are consistent, the pipeline section communicated with the liquid column pipeline section 31 is restored to the standard atmospheric pressure, the water column in the liquid column pipeline section 31 can be discharged, and the water in the centrifugal pump operation system 100 flows back to the low water level area.
In this embodiment, by opening and closing the bypass valve 4, the liquid column pipe section 31 can be adjusted to be closed when the centrifugal pump operation system 100 needs to maintain the vacuum state in the vacuum pipe section 32, and when the centrifugal pump operation system 100 is not in operation and drainage is needed, the bypass valve 4 is opened, and at this time, air is directly pumped out through the horizontal pipe section, so that the partial pumping capacity of the vacuum pump is not offset due to the height of the water column.
In an embodiment, as shown in fig. 5, a fourth embodiment of a control method of a centrifugal pump operation system according to the present invention is proposed based on the second embodiment, and the step S103 further includes:
and step S1042, controlling the centrifugal pump to stop working.
In a specific implementation, if the bypass valve 4 is not opened after the centrifugal pump 1 is controlled to stop working, a part of water column still remains in the liquid column pipe section 31, so that the residual water can be completely discharged, and the negative pressure value in the centrifugal pump operation system 100 is not affected.
And step S1052, controlling the water draining structure to drain the water in the liquid column pipe section.
In a specific implementation, the water draining structure is communicated with the liquid column pipe section 31 to drain water in the liquid column pipe section 31, the water draining structure may be a water pumping hole formed in a side wall of the liquid column pipe section 31, and the negative pressure device pumps the water in the liquid column pipe section 31 clean through the water pumping hole, so that the water in the centrifugal pump running system 100 is completely drained through the water draining structure.
In this embodiment, by setting the drainage structure, it may be ensured that no water column remains in the liquid column pipe section 31, so that the negative pressure value in the centrifugal pump running system 100 does not reach the acceptable standard when the water ring vacuum pump performs the pumping and draining again, thereby affecting the starting condition of the centrifugal pump 1.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (4)
1. The control method of the centrifugal pump operation system is realized based on the centrifugal pump operation system and is characterized in that the centrifugal pump operation system comprises a centrifugal pump, a vacuum pump, a connecting pipeline and a water supplementing device, a cavity is formed in the centrifugal pump, an exhaust port communicated with the cavity is formed in the top of the centrifugal pump, a liquid inlet and a liquid outlet communicated with the cavity are further formed in the centrifugal pump, the liquid inlet is communicated with a water source, the centrifugal pump is used for pumping liquid provided by the water source to the cavity and discharging the liquid from the liquid outlet, the vacuum pump is communicated with the exhaust port, and the vacuum pump is used for applying negative pressure to the cavity; the connecting pipeline is used for communicating the exhaust port and the vacuum pump, the connecting pipeline comprises a liquid column pipe section and a vacuum pipe section which are communicated in sequence, the liquid column pipe section extends up and down, the lower end of the liquid column pipe section is communicated with the exhaust port, and the upper end of the liquid column pipe section is communicated with the vacuum pump through the vacuum pipe section; the negative pressure generated by the vacuum pump enables the vacuum pipe section to form negative pressure, and the liquid column pipe section stores a liquid column; the vacuum pipe section is provided with a communicating pipe section extending up and down, the communicating pipe section and the liquid column pipe section are horizontally arranged at intervals, and the lower end of the communicating pipe section is communicated with the vacuum pump; the connecting pipeline further comprises an adjusting pipe section which is connected with the vacuum pipe section and the communicating pipe section in parallel, one end of the adjusting pipe section is communicated with the lower end of the communicating pipe section, the other end of the adjusting pipe section is communicated with the lower end of the liquid column pipe section, and a bypass valve is arranged on the adjusting pipe section; a check valve is arranged between the lower end of the communicating pipe section and the vacuum pump; the water supplementing device is connected with the water ring type vacuum pump and is used for supplementing water for the water ring type vacuum pump so that the water ring type vacuum pump reaches a starting state;
the control method of the centrifugal pump operation system comprises the following steps:
controlling the water ring type vacuum pump to work to generate negative pressure so as to enable the cavity to generate negative pressure, and enabling liquid provided by the water source to enter the cavity from the liquid inlet and flow into the liquid column pipe section;
closing the check valve when the liquid column pipe section is formed with a liquid column;
controlling the centrifugal pump to start working;
wherein, control the work of water ring formula vacuum pump produces the negative pressure, so that the cavity produces the negative pressure, the liquid that the water source provided from the inlet get into the cavity, and flow into the step of liquid column pipeline section includes:
opening the bypass valve;
controlling the water ring type vacuum pump to work to generate negative pressure so as to enable the cavity to generate negative pressure, and enabling liquid provided by the water source to enter the cavity from the liquid inlet;
when the chamber is full of the liquid, the bypass valve is closed such that the liquid flows into the liquid column tube segment.
2. The method of controlling a centrifugal pump operation system according to claim 1, wherein the step of controlling the centrifugal pump to start operating further comprises, after:
controlling the centrifugal pump to stop working;
the bypass valve is opened.
3. The method of controlling a centrifugal pump operation system according to claim 1, further comprising a drain structure provided in communication with the liquid column tube section for draining liquid in the liquid column tube section;
the step of controlling the centrifugal pump to start to work further comprises the following steps:
controlling the centrifugal pump to stop working;
and controlling the water draining structure to drain the water in the liquid column pipe section.
4. The method of claim 1, wherein the liquid column tube section is located above the liquid inlet, and a height difference between an upper end of the liquid column tube section and the liquid inlet is greater than 10.5 meters.
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| CN202110582383.8A CN113294345B (en) | 2021-05-27 | 2021-05-27 | Centrifugal pump operation system and control method for centrifugal pump operation system |
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| US4067663A (en) * | 1973-03-19 | 1978-01-10 | The Chemithon Corporation | Sewage pump priming system |
| CN112112810A (en) * | 2020-07-31 | 2020-12-22 | 辽宁三三工业有限公司 | Pump priming system and method of centrifugal pump system |
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| GB167006A (en) * | 1920-05-03 | 1921-08-03 | Drysdale & Co Ltd | Improvements relating to centrifugal and the like pumps |
| JPH0626489A (en) * | 1992-04-28 | 1994-02-01 | Hori Giken Kogyo Kk | Steam separator |
| US6692234B2 (en) * | 1999-03-22 | 2004-02-17 | Water Management Systems | Pump system with vacuum source |
| CN205478358U (en) * | 2015-12-31 | 2016-08-17 | 上海连成（集团）有限公司 | Vacuum diversion equipment |
| CN108019358A (en) * | 2018-01-12 | 2018-05-11 | 安徽阿莫斯泵业有限公司 | A kind of centrifugal pump auxiliary self-priming apparatus |
| WO2020198411A1 (en) * | 2019-03-27 | 2020-10-01 | Baker Hughes, A Ge Company, Llc | High flow and low npshr horizontal pump with priming module |
| CN215566811U (en) * | 2021-05-27 | 2022-01-18 | 湖北华电武昌热电有限公司 | Centrifugal pump operating system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4067663A (en) * | 1973-03-19 | 1978-01-10 | The Chemithon Corporation | Sewage pump priming system |
| CN112112810A (en) * | 2020-07-31 | 2020-12-22 | 辽宁三三工业有限公司 | Pump priming system and method of centrifugal pump system |
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